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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// IP sockets stubs for Plan 9
package net
import (
"errors"
"io"
"os"
"time"
)
// probeIPv6Stack returns two boolean values. If the first boolean value is
// true, kernel supports basic IPv6 functionality. If the second
// boolean value is true, kernel supports IPv6 IPv4-mapping.
func probeIPv6Stack() (supportsIPv6, supportsIPv4map bool) {
return false, false
}
// parsePlan9Addr parses address of the form [ip!]port (e.g. 127.0.0.1!80).
func parsePlan9Addr(s string) (ip IP, iport int, err error) {
var (
addr IP
p, i int
ok bool
)
addr = IPv4zero // address contains port only
i = byteIndex(s, '!')
if i >= 0 {
addr = ParseIP(s[:i])
if addr == nil {
err = errors.New("net: parsing IP failed")
goto Error
}
}
p, _, ok = dtoi(s[i+1:], 0)
if !ok {
err = errors.New("net: parsing port failed")
goto Error
}
if p < 0 || p > 0xFFFF {
err = &AddrError{"invalid port", string(p)}
goto Error
}
return addr, p, nil
Error:
return nil, 0, err
}
func readPlan9Addr(proto, filename string) (addr Addr, err error) {
var buf [128]byte
f, err := os.Open(filename)
if err != nil {
return
}
n, err := f.Read(buf[:])
if err != nil {
return
}
ip, port, err := parsePlan9Addr(string(buf[:n]))
if err != nil {
return
}
switch proto {
case "tcp":
addr = &TCPAddr{ip, port}
case "udp":
addr = &UDPAddr{ip, port}
default:
return nil, errors.New("unknown protocol " + proto)
}
return addr, nil
}
type plan9Conn struct {
proto, name, dir string
ctl, data *os.File
laddr, raddr Addr
}
func newPlan9Conn(proto, name string, ctl *os.File, laddr, raddr Addr) *plan9Conn {
return &plan9Conn{proto, name, "/net/" + proto + "/" + name, ctl, nil, laddr, raddr}
}
func (c *plan9Conn) ok() bool { return c != nil && c.ctl != nil }
// Implementation of the Conn interface - see Conn for documentation.
// Read implements the net.Conn Read method.
func (c *plan9Conn) Read(b []byte) (n int, err error) {
if !c.ok() {
return 0, os.EINVAL
}
if c.data == nil {
c.data, err = os.OpenFile(c.dir+"/data", os.O_RDWR, 0)
if err != nil {
return 0, err
}
}
n, err = c.data.Read(b)
if c.proto == "udp" && err == io.EOF {
n = 0
err = nil
}
return
}
// Write implements the net.Conn Write method.
func (c *plan9Conn) Write(b []byte) (n int, err error) {
if !c.ok() {
return 0, os.EINVAL
}
if c.data == nil {
c.data, err = os.OpenFile(c.dir+"/data", os.O_RDWR, 0)
if err != nil {
return 0, err
}
}
return c.data.Write(b)
}
// Close closes the connection.
func (c *plan9Conn) Close() error {
if !c.ok() {
return os.EINVAL
}
err := c.ctl.Close()
if err != nil {
return err
}
if c.data != nil {
err = c.data.Close()
}
c.ctl = nil
c.data = nil
return err
}
// LocalAddr returns the local network address.
func (c *plan9Conn) LocalAddr() Addr {
if !c.ok() {
return nil
}
return c.laddr
}
// RemoteAddr returns the remote network address.
func (c *plan9Conn) RemoteAddr() Addr {
if !c.ok() {
return nil
}
return c.raddr
}
// SetDeadline implements the net.Conn SetDeadline method.
func (c *plan9Conn) SetDeadline(t time.Time) error {
return os.EPLAN9
}
// SetReadDeadline implements the net.Conn SetReadDeadline method.
func (c *plan9Conn) SetReadDeadline(t time.Time) error {
return os.EPLAN9
}
// SetWriteDeadline implements the net.Conn SetWriteDeadline method.
func (c *plan9Conn) SetWriteDeadline(t time.Time) error {
return os.EPLAN9
}
func startPlan9(net string, addr Addr) (ctl *os.File, dest, proto, name string, err error) {
var (
ip IP
port int
)
switch a := addr.(type) {
case *TCPAddr:
proto = "tcp"
ip = a.IP
port = a.Port
case *UDPAddr:
proto = "udp"
ip = a.IP
port = a.Port
default:
err = UnknownNetworkError(net)
return
}
clone, dest, err := queryCS1(proto, ip, port)
if err != nil {
return
}
f, err := os.OpenFile(clone, os.O_RDWR, 0)
if err != nil {
return
}
var buf [16]byte
n, err := f.Read(buf[:])
if err != nil {
return
}
return f, dest, proto, string(buf[:n]), nil
}
func dialPlan9(net string, laddr, raddr Addr) (c *plan9Conn, err error) {
f, dest, proto, name, err := startPlan9(net, raddr)
if err != nil {
return
}
_, err = f.WriteString("connect " + dest)
if err != nil {
return
}
laddr, err = readPlan9Addr(proto, "/net/"+proto+"/"+name+"/local")
if err != nil {
return
}
raddr, err = readPlan9Addr(proto, "/net/"+proto+"/"+name+"/remote")
if err != nil {
return
}
return newPlan9Conn(proto, name, f, laddr, raddr), nil
}
type plan9Listener struct {
proto, name, dir string
ctl *os.File
laddr Addr
}
func listenPlan9(net string, laddr Addr) (l *plan9Listener, err error) {
f, dest, proto, name, err := startPlan9(net, laddr)
if err != nil {
return
}
_, err = f.WriteString("announce " + dest)
if err != nil {
return
}
laddr, err = readPlan9Addr(proto, "/net/"+proto+"/"+name+"/local")
if err != nil {
return
}
l = new(plan9Listener)
l.proto = proto
l.name = name
l.dir = "/net/" + proto + "/" + name
l.ctl = f
l.laddr = laddr
return l, nil
}
func (l *plan9Listener) plan9Conn() *plan9Conn {
return newPlan9Conn(l.proto, l.name, l.ctl, l.laddr, nil)
}
func (l *plan9Listener) acceptPlan9() (c *plan9Conn, err error) {
f, err := os.Open(l.dir + "/listen")
if err != nil {
return
}
var buf [16]byte
n, err := f.Read(buf[:])
if err != nil {
return
}
name := string(buf[:n])
laddr, err := readPlan9Addr(l.proto, l.dir+"/local")
if err != nil {
return
}
raddr, err := readPlan9Addr(l.proto, l.dir+"/remote")
if err != nil {
return
}
return newPlan9Conn(l.proto, name, f, laddr, raddr), nil
}
func (l *plan9Listener) Accept() (c Conn, err error) {
c1, err := l.acceptPlan9()
if err != nil {
return
}
return c1, nil
}
func (l *plan9Listener) Close() error {
if l == nil || l.ctl == nil {
return os.EINVAL
}
return l.ctl.Close()
}
func (l *plan9Listener) Addr() Addr { return l.laddr }
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